Add explicit module names to API reference section of the docs [ci skip]

docs/api/daemon/index.rst

-Daemon
-======
+Daemon (`pyhmmer.daemon`)
+=========================
 
 .. currentmodule:: pyhmmer.daemon
 
@@ -18,4 +18,4 @@ Client
     :hidden:
     :caption: Client
 
-    Client <client>
\ No newline at end of file
+    Client <client>

docs/api/easel/index.rst

-Easel
-=====
+Easel (`pyhmmer.easel`)
+=======================
 
 .. currentmodule:: pyhmmer.easel
 

docs/api/errors/index.rst

-Errors
-======
+Errors (`pyhmmer.errors`)
+=========================
 
 .. currentmodule:: pyhmmer.errors
 
@@ -50,4 +50,4 @@ Runtime Errors
     :hidden:
     :caption: Runtime Errors
 
-    Runtime Errors <runtime>
\ No newline at end of file
+    Runtime Errors <runtime>

docs/api/hmmer/index.rst

-HMMER
-=====
+HMMER (`pyhmmer.hmmer`)
+=======================
 
 .. currentmodule:: pyhmmer.hmmer
 

docs/api/index.rst

@@ -9,8 +9,8 @@ This section contains a complete reference of the API of the different
 .. toctree::
    :maxdepth: 2
 
-   HMMER <hmmer/index>
-   Easel <easel/index>
-   Plan7 <plan7/index>
-   Daemon <daemon/index>
-   Errors <errors/index>
+   hmmer/index
+   easel/index
+   plan7/index
+   daemon/index
+   errors/index

docs/api/plan7/index.rst

-Plan7
-=====
+Plan7 (`pyhmmer.plan7`)
+=======================
 
 .. currentmodule:: pyhmmer.plan7